I have an issue about this, too. I use a zenfone 2 and the default music app is "music" when you check it with with the phone's "app info" and the "default app manager" app. But despite that, 10k utilizes Google's "Play Music" playlists which I almost never use. I've changed the phone's default app to several others, from Poweramp to Hiby, with no avail. Is there a simple and an absolute solution to access the playlists that I want from within 10K? This is very frustrating... Enough to switch running apps